Set an expiration date on list items in SPS2003

I have an SPS2003 environment wherein a client is trying to set itemsto expire in 30, 60, or 90 days after they've been posted in a list.They envision this working much like a Announcement, where you can setan Expires item.

I have tried adding a column called 'Expires' and then changing theview but that's where we cannot see a good way to adjust the viewwithout having to change the greater than date every day.

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